Humboldt City Of STP
2405 Gotch Park Rd., Humboldt, IA 50548 · Humboldt County · Publicly Owned Treatment Works
- Average flow
- 0.72 MGD
- Design flow
- 2.7 MGD
- NPDES permit
- IA0047791
- Effective
- Permit expires
- October 2030
- Population served
- 4,568
- CWNS 2022
Humboldt City Of STP is a publicly owned wastewater treatment works in Humboldt, Humboldt County, Iowa treating an average of 0.72 million gallons per day against a permitted design capacity of 2.7 MGD, serving about 4,568 residents. It discharges under NPDES permit IA0047791 (effective), which expires in October 2030, with 1 recorded violation in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Humboldt City Of STP.
Available with a free Klarifi account
See the full treatment train at Humboldt City Of STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Industrial users and pretreatment
Industries that discharge process wastewater to Humboldt City Of STP, from the plant's pretreatment programme records.
- Industrial users
- 1
- on record
On record: Jet Company (Humboldt). Most users are in automotive, metal and equipment manufacturing.
Unlock the details behind these industrial users
Discharge flow, federal category, source documents and contacts for every industrial user of Humboldt City Of STP. Free with a Klarifi account.
Key contacts
2 verified contacts for Humboldt City Of STP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Humboldt City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Dakota City · 2 mi away
0.1 MGD
Rutland · 5 mi away
—
Badger · 7 mi away
—
Thor · 9 mi away
—
Clare · 11 mi away
—
Bode · 12 mi away
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Livermore · 12 mi away
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Gilmore City · 12 mi away
0.08 MGD
Humboldt City Of STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated August 11, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms